Punching machine



May 20 19 4- v 1,494,773

w. H. DARDENNE Puncnm momma Filed March a. 1921 s Sheet-Sheet' 1 e .w a g Inventor, miness i I m) ,y 5 m m a ES, em m W In 0 DMM w an

May 20, 1924. 1,494,773

w. H. D'ARDENNE PUNCHING MACHINE Filed March 8. 1921 6 Sheets-Sheet 4 frivenior:

I May, 20 ,1924. 1,494,713

W. H. DARDENNE v PUNCHING MACHINE Filed March 8 1921 6 Sheets-Sheet 5 J1 i? I 5 37 5.53 1

Patented May 20, 1924.

" UNITED STATES PATENTQFFICEQIL;

WALTER H. DARDENNE, F IHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO EDWARD G. BUDD MANUFACTURING COMPANY, PHILADELYHIA, PENNSYLVANIA,"A COR- PORATION OI PENNSYLVANIA.

PUNCHING MACHINE.

Application filed March a, 1921. semi No. 450,573.

To all whom it may concern: I

Be it known that I, \VALTER H. DAR- DENNE, residing at Philadelphia, Pennsylvania, have invented certain new and useful Improvements in Punching Machines, of which I declare the following to be a full, clear, and exact description.

This invention relates to improvements in punching machines and has to do more particularly with automatic machines for punching a plurality of holes at one operation in a sheet of metal.

Oneof the leading objects of my invention is to provide a metal punching machine so constructed that it requires a very small amount of space above and at one side of the die or dies, so that it is capable of working on irregularly shaped stampings having portions which overhang the surface to be perforated.

Another of the objects of my invention is to provide a metal punching machine in which the punch, or punches, are carried by a rocking member, or members, so that the punch moves along a curved path in moving towards and from the die in which it works.

Another object of my invention is to provide a metal punching machine particularly adapted to form a plurality of holes at one operation and capable of working on irregularly shaped stampings, having portions which overhang the dies, in which the punches are so actuated that they enter the metal successively thus lessening the maximum power requirement-of the machine and rendering it more efficient.

Another object of my invention is to provide a punching machine in which the punches are carried by a series of swinging rock arms so arranged that the punches move towards the die along curved paths, the means for actuating the rock arms being such that they are actuated in different phase and the. punches enter the metal suc-.

" cessively so as to minimize the maximum power requirement of the machine.

In the manufacture of automobile bodies, the rear portion of the body isirequently formed by a curved tonnea'u panel, the lower side portions of which arepressed inwardly so as to form inwardly extending wheel housings. The upper wall of each wheel housing is curved and in some cases a series of holes are formed in this curved upper wall to receive the bolts for attaching the fender, One of the objects of my invention is to prov vide a punching machine in which the holes in the upper curved walls of the wheel housings of a tonneau panel are punched 'at' a single operation. j Further objects, and objects relating to economies of material and details of con? struction, will definitely appear from the detailed description to follow: In one instance, I accomplish the objects of my invention by the devices and means described in the followin specification. My inventionisclearly de ned and pointed out in the appended claims. A structure constituting a preferred embodiment of my invention is illustrated in the accompanying drawin form ing a part of this specification, in w ich:

. Fig. I is a plan view of a machine embodyk ing my inventionshowing a tonneauipanel in place in the machine.

Fig. II is a longitudinal, sectional view through the machine, taken on the line 11-- II of Fig. III, the tonneau panel being shown in section. I

Fig. III is a view of the machine, partly in p an and part1 ,in section on the line IIIIII ofFig. I, the tonneau panel being removed. y a

- ig. IV is a vertical, sectional view taken on the line IV-IV of Fig. II. I

,Fi .-V is a sectional view taken on the line V of Fig. II.

Fig. VI is a view of the machine in end elevation. I Fig. VII is a detail, sectional'view taken substantially on the line VIIVII of Fig. VIII is avdetail sectional view showin one of the clamps and, taken on the line VIIIVIII ,of Fig. III.

Fig. IX is an enlarged detail, sectional corresponding to a part of Fig. II

or type of tonneau panel on which the machine as illustrated is adapted to operate Similar reference numerals refer 'to simi-,

lar parts throughout the several 'views, and

one or more swinging rock arms which carry one or more punches adapted tocooperate' with said dies and arranged so thatthe punch moves in a curved path as it moves towards and from the die. This arrangement requires very little space above the die for the punch-carrying parts, /so that the machine is particularly adapted for punching holes in irreguglarl shaped stampings, having por'ions whic overhang the surface in whic the holes are formed. Practically all of the punch-operating mechanism'will be located on one side of'the I vertical plane through the dies, so that this machine is adapted-for punching many irregularly shaped stampings or pieces which cannot be handled in other machinesdue to the location of the/[punch-operating parts With reference to the work-bed and dies Therock arm or arms may be rocked by any suitable means, so as to cause the punches ,to move towards and from the dies,

as, for illustration, through connections with a driven shaft, and, where there are a plurality of rock arms, I prefer to use driving'connections such that the rock arms move in different phase so that the punches enter the metal successively, This distributes the strain and reduces the maximum power requirement of the machine. I have shown one illustrative form of driving connections for the rockarms, which functions in this manner, and whic ,in this instance, includes an eccentric on t e'driven shaft and a collar rotatably mounted on the eccentric, and connected by links to the respective rock arms. V

In this application, I show.- and describe a machine which is designed particularly for punching a series of holes, at one operation, in certain portionsof a tonneau panel. In some automobile bodies, the rear portion of the body shell is formed by a curved tonneau panel and the side portions of this panel are pressed inwardly so as to give clearance for the wheels. These portions. which are pressed inwardly, are called wheelhousings and their upper walls are curved. This machine has work-beds so formed as to receive and support the upper walls of the wheelhousings, the. tonneau panel being slid laterally intothe machine and supported therein with said upper walls of the wheelhousings resting on thesworkbeds. In this machine, there are two sets of punclhholders, one set ,for each wheeland form a series of holes in the curved upper wall of the wheelhousing. This is all done at a single operation. There may also be aseries of holes to be formed in the side walls of the wheelhousings and I may do this, at the sameoperation, by providing laterally reciprocating punch holders which may be actuated from the same driven shaft as the swinging rock arms. a

One embodiment ofmy invention .is the machine illustrated in the drawings, which comprises a table, 10, carrying the upwardly extending heads, 11, at each end thereof. The inner walls of the heads, 11, may have the horizontal ledges, 12, formed thereon to support the bottom flanges of the tonneau panel. ,At the upper portions of these heads, 11, there are formed the curved work-beds, 13, in which a plurality of dies, 14, are

mounted,- These work-beds are curved so,

as to conform to thoseparts of the wheel housings which are to be perforated and which rest on them. Each head, 1},has an arm 15, which extends forwardly worlr-bed. 13, as shown more particularly in Fig. VI. These arms, lfi have the/ver tically extending shoulders," 16 and/17y formed'therein, against whichthe forward edges of the tonneau panel are, clamped.

A drive shaft, 18, may be journaledin'" thebosses, 19, of the heads, 11. as shown in Fig. II. This drive shaft may also be journaled in the bosses, 21, formed on the frame members, 20, located between the two heads,

11. These frame members, 2Q,. have a plurality of guide-ways, 22, formed therein, along lines radial'to the axis: of the shaft,

18, in which the push-rods, 23, are sli'dably mounted, being retainedin place by the from the,

cover-plates, 24: closing the open sides'of I said guide-ways. On the frameniembers, 20, there aremounted a plurality of rocker arm holders, the bases, 25, ofwhich are dove-tailed and fit in the dove-tailed grooves of the frame member, 20. There are shown three of these holders mountedy-on each frame member with the bases "arranged so that they are substantially tangent with a circle concentric with shaft, 18'. Each of these holders has a pair of parallel arms,

26, extending laterally from the baseuand I each pair of arms carries a pivot pin, 27, on which a rock 211171.28. is t'ulerumed. /Due,

to the arrangement of the rock arm holders on the frame member, these rock arms swing in planes containing the axis of shaft, 18, and each rock arm carries one or more punches, 29, which coact with corresponding dies, 14,'carried by the work-bed. The

I on each eccentric.

arms and other parts.

punches travel indcurved paths due to the fact that they are carried by the swinging rock arms. The rock zontal plan' 'containing the fulcrum axis of the arm lying slightly below the plane containing the point of contact of the punch with the metal when the punch is advanced to its work. As a result the punchengages the metal at a slight angle tothe perpendicular and one e' ge of the punch enters" the metal inadvance of theother, as shown in Fig. IX. This gives a sort of shearing' action and lessens .the strain on the rock The rear end of each rocker arm, 28, ,may bepivotally connected to the upper end of an idler link, 31, by a pin, 30, the lower end of, said link being iyotally connected to the'up'per end of the push-rod, 23. I The shaft, \18, may have eccentrics, 32,

formed thereon, in line with the pushrods,

33, is rotatably mounted Iniorder to pro'vide connections with the push rods, these collars 33, and a vertically may each have a flange, extending arm, 34. In the machine shown, the lower end of ,the'central push-rod, 23, of each set, is pivotally connected by the pin, 35, to the upper end of the arm, 34. The push-rods, 23, at each side of the central push-rod, may be connected to the flange. 33', by. links, 53.'

As I have indicated above, in some cases it is desirable to form a series-of holes in the side walls of the wheel housings. In Fig. VII, I have shown a mechanism for punching these holes. This comprises the dies,'36, which are positioned in the sides of the heads, 11, as shown, with'respect to one gang, in Fig. VII. A guide-way, 37, may be formed in the frame member, 20, and a push-rod, 38, slidably mounted in such guide-way, the open side of which may be closed by the cover-plate, 39. A horizontally extending guide-way, 40, may also be formed in the frame member, punch holder, 41, slidably mounted in this] guide-Way. The open side of this guideway may be closed by" the cover-plate, 42. The punch-holder may carry a plurality of punches, 43, coactin'g with the dies, 36. This punch-holder may be actuated in various ways, for instance, by a toggle linkage, the rear link, 45, of which may be pivoted to the frame member at 44, and the front link,

23, and a collar,

46. pivotally connected to the rear end of the sliding punch-holder, 41. The links, 45 and 46, are pivotally connected together and to the upper end of a tension 1ink,-47, by the pin, 48. A rocker link, 49, may be pivpivotally.

20, and a oted to thefframe at 51. "One end of the rocker link, 49, maybe pivotally connected to the lower end of the tension link, 47 and the other end f said rocker link may be pivotally connected, at 52, to the upper end of the push-rod, 38, the; lower end of said push rod being connected 'to the collar flange, 33, by the link, 53." This provides a simple and efficient mechanism-(for: reciprocatin the punch holder, 41, along a, line paralle to the shaft, 18, from which it is i g I driven. 1 v

' It isdesirable, of course, to provide various clamp's so as to hold the tonneau p'anel firmly and rigidly in place in the machine during the punching operation. tain clamping devices which I have used and have found to be very efficient in this machine, but it will be understood that other suitable clamping devices may be" used if desired. In this machine I have provided a bracket, 54, on the which oneendof the link, 55, is pivoted. 'A bell-crank lever, 56, is also pivoted to the bracket, Y54, and a bent link, 57, has one end connected, at 58, to one arm of the bell-crank lever, 56. The outer end of'theYlink, 55, is connected to the link, 57 j at the bend in the link.

stud, 61, may be adjustably mounted. This stud,'61-, has a curved clamping block, 62,

Ihave shown der- 3 The outer end of the bent I, link,,57, has an enlarged boss, 60, in which a frame 'member, 2O, on

which conforms to the surface of the workbed, 13, so as to vice is sho wn in Fig. VIII and its location on the frame is shown in Bynsing the free lerfd of the bell-crank lever. 56/, as a handle, and swinging it ,to the left,

in Fig. VIII, the {toggle linkage, formed'by the other 'arm of he bell-crankgever and the link, 57, is broken and the dl mping block swung back so as to permit the removal of the stamping. In theposition shown in Fig. VIII, the parts are locked, due to "the toggle effect, I may also provide similar clamping devicesfwhich engage the front 'edges of .the/tonne'au panel and clamp them against the 'shouldrs,16and 17, of the 15, projecting from thework-beds.

arms;

This

clamp the wheel housing in 4 place on thewo'rk-bed, This clampingde- Figs. 1 and 111.-

lOO

clamping device may comprise a bracket, 63,

on which the bent link, 66, is-pivotally mounted item. The free end of the link, 66,

carries a stud, 65, which n iay'be adjustably mounted therein, on whichthere is the clamping block, 64? A bell-crank lever, 68, is pivotally mounted at 69, on the4end of the 1dler link, 70, which is pivotally connected a.t-7-1 to the bracket, 62. I The inner end of the be-llrcrank: lever,68, may be pivotally connected at 72, to the central part of the bent link, 66.

The shaft, 18, may be driven in any manner from any su table source of power, but it is desirable that the drive be such that,

when it is disconnected, the swingin rock arms and sliding punch-holders will e removed'from the work-bed soas to permit of theremoval of the stamping. In the machine illustrated, I have provided a motor drive, so that the machine is self-contained, which drive includes a gear, 73, loosely mounted on the shaft, 18, and meshing with the pinion, 82, on the idler shaft, 88, which idler shaft carries the gear, 84, meshing with the pinion, 85, on the shaft of the motor, 86.

I have provided a clutch mechanism for controlling the driving connections of the shaft, 18, which clutch connection comprises the clutch disc, 75, fixed on the shaft,.18, and carrying a sliding bevelled latch, 76, which is pressed in the direction of the gear, 73, by a spring, 77. The gear, 73, hasa PIOJQCtlIlg part, or clutch pin, 7 4, extending toward the clutchdisc, 75, in position to engage the latch, 7 6, when the latter is projected, so as to drive the clutch disc-from the gear, 73. A pivoted pawl, 78, is mounted so that its nose is in a position to engage the bevel of the latch, 76, to retract it, being normally held in such position by the spring, 78. A link, 79, is connected to the pawl, 7 8, by whichto withdraw it from the retracting position against the tension of spring, 7 8, such link being actuated'by the footlever, 80. A spring-brake, 81, may act on the shaft, 18, so as to stop its rotation as soon as the drive is disconnected. This form of clutchis one which allows a complete rotation of the shaft, 18, each time that the foot lever is depressed and the arrangement is such that the shaft is always stopped at the same point in its rotation. I am not, however, to be restricted to this particular form of clutch connection, as there are many others whic h may be used with equal satisfaction in this mechanism.

In operation, the tonneau panel, A, is first inserted in the machine, with the lower flan es, a, resting on the ledges, 12, of the hea s, 11, and the upper curved walls, I), of the wheel housingsresting on the curved work-beds, 13. The side walls, I), of the wheel housings are dispbsed against the inner side faces of the heads, 11, below the curved work-beds, 13, as shown with respect to one of the wheel housings, in Fig. VII. The flanged forward edges of the tonneau panel, A, engage the shoulders, 16 and 17, of the forwardly extending arms, 15, and are clampedthere'by the clamp blocks, 64. The wheel housings are also clamped to the work-beds, 13, by the clamping blocks, 62. The operator then depresses the footlever, 80, and this action projects the'clutch latch, 76, so that it is engaged by the clutchpin, 74, of the ear, 73, and the driven shaft, 18, is carried forward through one revolution. This action causes the oscillation of the respective swinging rock arms so that each of the punches, 29, carried thereby, perforates the metal of the curved upper Walls of the Wheel housings. punch holders, 41, are also reciprocated so The .the metal successively. The result is that the strain is distributed and the power required to operate the machine is not nearly so great as if all of the punches entered the metal at the same time. Furthermore, the dies, 14, are soset in-the curved work-bed, 13, that one edge of the punch engages the metal slightly in advance of the other. This is due to the fact that the axis of the die is tangent to the curved path of the punch at a point a very slight distance below the top of the die, so that the'punch enters the die at a very slight angle. This gives a shearing action to the punch which helps to re lieve the strain on the machine. As soon as the shaft, 18, completes one revolution, the foot lever being released, the pawl, 78, is in position so that it retracts thelatch, 76, as soon as the latter comes into engagement with it. disconnected at the endof the revolution of the shaft, and the spring-brake, 81, stops the shaft at once so as to hold the punch-holders and rock arms in their withdrawn position.

I am aware that the particular machine which I have disclosed in this application, may be changed considerably without departingfrom the spirit of my invention, and, therefore, I claim my invention broadly, as Well as specifically, as indicated by the appended claims.

Having thus described my invention, what I claim as new and useful in my invention, and desire to secure by Letters Patent is: e

1. A machine of the class described comprising a stationary bed on which the part to be punched rests, a swinging rock arm, a punch carried thereby and co-operating with said bed, and means for oscillating said swinging rock arm to cause said punch to move in a curved path to and from said bed,.the axis about which said arm swings lying in' a horizontal plane below the plane of contact of the punch with the work.

As a'result, the drive vis 2. A machine of the class described comprising a stationary bed on which the partto be punched rests, a die carried by said bed, a swinging rock arm having a fixed pivot at one side of said die and disposedin a horizontal pla-ne below the plane of contact of the punch with the work, a punch carried thereby, said die being disposed in relation to said punch to co-operate therewith when said arm is rocked, and means for oscdlatmg said swinging rock arm to cause said punch to move in a curved path to and from said die.

3. A machine of the class described comprising a stationary bed on which the part to be punched rests, a die carried by said bed, a swinging rock arm having a fixed pivot and constituting a lover of the first order, a punch carried thereby, said die being disposed in relation'to said punch to co-operate therewith when 'said arm is rocked, and means for oscillating said swinging rock arm to cause said punchto move in a curved path to and from said die.

4. A machine of the class described comprising a bed on which the part to be punched rests, a die carried by said bed,

' cooperate therewith when a frame member, a swinging rock arm pivoted therein with one end thereof overhanging the die, a punch carried by the overhanging end of said rock arm, said die being disposed in relation to said punch to co-operate therewith when said arm is rocked, and means for oscillating said swinging rock arm to cause said punch to move in a curved path toand from said die, said rock arm being pivoted in the frame in a horizontal plane below the plane of contact of the punch with the work.

5. A machine of the class described comprising a bed or, which the part to be punched rests, a die carried by said bed, a frame member, a swinging rock arm pivoted therein with one end thereof overhanging the die, a punch carried by the overhanging end of said rock arm, said die b'eing disposed in relation to said punch to co-operate therewith when said arm is rocked, a push rod connected to said rock arm and confined to reciprocating motion in a straight line, and means for reciproeating said push rod.

6. A machine of the class described comprising a bed onwhich the part to be punched rests, a die carried by said bed, a frame member, a swinging rock arm pivoted therein with one end thereof overhanging the die, a punch carried by the over hanging end of said rock arm, said die being disposed in relation to said punch to cooperate therewith when said arm is rocked, a push rod, means 'toconfine said rod to longitudinal movement, a link connecting said push rod and said rock arm, and means for reciprocating said push rod.

7. A machine of the class described comprising a bed on which the part to be punched rests, a die carried by said bed, a frame member, a swinging rock arm pivoted therein with one end thereof overhanging the die, a punch carried by the overhanging end of said rock arm said die being disposed in relation to said punch to said arm is arms for oscillating the latter. 13. A machine of the class described'comarm, means to confine said rod to longi.

tudinal movement, a driven shaft, an eccentric on said shaft, and means for reciprocating said push rod from said eccentric.

8. A machine of the class described comprising a bed on which the part tobe punched rests, a die carried by said bed, a frame member, a swin ing rock arm piv oted therein with one en thereof overhanging the die, a punch carr ed by the overhanging end of said rock arm said die being disposed in relation to said punch to cooperate therewith when said arm is rocked, a push rod connected to said rock arm, a driven shaft, an eccentric on said shaft, and a collar within which said eccentric is rotatably mounted and to which said push rod is connected.

9; A machine of the classdescribed comprising a bed on which. the'partto be punched rests, a die carried by said bed, a frame member, a swinging-rockarmpivoted therein with one end, thereof-overhanging the die, a punch carried by the overhanging end of said rock arm and cooperating'with said die, a push rod connected to said rock arm, means to confine said rod to longitudinal movement, a driven shaft, an eccentrio on said shaft, a collar within which said eccentric is rotatably mounted, an'd'a link connecting said push rod and said. collar.

10. A machine of the classdescribed comprising a bed on which the part to be punched rests, a die carried by said bed, a

swinging rock arm, a punch carried thereby:

ing edge portions, and means for oscillating said swinging rock armto cause said punch to move in a curved path to and from said] die. '"11. A

machine of the class described comprising a curved work-bed, a frame member,

a plurality of swinging rock armspivotedp on said frame member, said rock arms being i so positioned that they oscillate in planes substantially radialto the curvedwork-bed, i

and means for oscillating said rock arms.

12. A machine of the class described comprising a work-bed adapted to receive and position the work in the machine, a plural-- 'ity of swinging rock. arms, punches carried by said rock armsv andcooperating'with the work-bed to punch work positioned thereon,

a rotating drive shaft, said swinging rock" arms [being mounted to oscillate in planes substantiallyradial to said shaft, and con-' nections between said shaft and the rock prising a curved work-bed on which the part to be punched rests, a plurality of swinging rock arms, punches carried thereby and cooperating with said Work-bed, the pivotal axes of said rock arms being so disposed with relation to the work-bed that the punches engage the metal on the work-bed at a slight angle from the perpendicular,

'and means for oscillating said rock arms.

14. A machine of the class described comprising a curved work-bed on which the part to be punched rests, a plurality of swinging rock arms, punches carried thereby and co: operating with said work-bed, said rock arms being so pivoted that the punchesengage the metal on the work-bed in advance of a horizontal position of said arms and at a slight angle from the perpendicula -and means for oscillating said rock arms in a-predetermined sequence. I

15. A machine of'the class described comprising a curved work-bed, a frame member, a plurality of rock-arm carriers mounted on said frame member, a swinging rock arm pivoted on each carrier, punches -carried by said rock arms-and cooper'ating with said work-bed, said carriers being so positioned that the rock arms oscillate in planes substantially radial with respect to the curved Work-bed, and means for oscillating said rock arms.

16. A machine of the class described comprising a Work-bed, a plurality of pivotally mounted swingingroc arms,'punches' carried by said rock arms and cooperating with said work-bed, a driven shaft, and means for oscillatingsaid rock arms from said driven shaft, the pivotal axes of said rock arms being located nearer said shaft than are=the points of initial contact 'of the puncheswith the work carried by the work-bed.

17. A machine of the class described comprising a work-bed, a plurality of swinging rock arms, punches carried by: said rock arms and cooperating with said work-bed, a driven shaft, and means for oscillating said rock arms from said driven shaft in a predetermined sequence.

18. A machine of the class described comprising a curved work-bed, a plurality of pivotally mounted swinging "rock arms, punches carried by said-rock arms and cooperating with said work-bed, a driven rotating shaft having its axis substantially coincident with the axis of the curved workbed, and means for oscillating said rock arms from said driven shaft.

19. A machine of the class'd'escribed comprising a curved work-bed, a plurality-of swinging rock arms, punches carried by said rock arms and cooperating with'said workbed, a driven shaft having its axis substantially coincident with'the axis of the curved worksbed, and means for oscillating-said rock arms from saiddr'rven "shaft in a predetermined sequence.

20. A machine of the class described comprising a curved work-bed, a driven rotating shaft having its axis substantially coincident with that of the curved work-bed, a plurality of pivotally mounted rock arms swinging in planes radial with respect to the axis of said shaft, punches carried by said rock arms and cooperatin and means for oscil ating said rock from said driven shaft.

21. A machine of the class described comprising a curved work-bed, a plurality of swinging rock arms, punches carried by said rock arms and cooperating with said work a driven shaft, a plurality of push-rods connected to said rock arms, guiding means in which said push-rods lon sai push-rods from the driven shaft.

. 22. A machine of the class described comprising a curved Work-bed, a plurality of swinging rock arms, punches carried by said rock arms and cooperating with said Workbed, a driven shaft, a plurality of push rods, guiding means in which said push rods are mounted to slide longitudinally, links connecting said push rods and the rock arms, and means for reciprocating said push rods from the driven shaft.

23. A machine of the class described comprising a curved work-bed, a plurality of ilI'lllS swinging rock arms, punches carried by said rock arms and cooperating with said workbed, a driven shaft, a plurality of push rods, guiding means in which said push rods are mounted to slide longitudinally, links connecting said push rods and the rock arms, an

eccentric on said shaft, and means for reciprocatihg said push rods from said eccentric.

24. A machine of the class described comprising a curved Work-bed, a plurality of swinging rock arms, punches carried by said rock arms and cooperating with said workpush rods are connected.

A machine of the class described comprislng a curved Work-bed, a driven shaft having its axis substantially coincident with I reciprocating punch-holder, punches respecwith said work-bed,-

itudinally and means for reciprocating tivel v carried by said rock arms and punchholder and cooperating with said work-bed and a common means for actuating said rock arms and punch holder.

27. A machine of the class described com prising a work-bed, a driven shaft, a plurality of pivotally mounted swinging rock arms, a laterally reciprocating punch-holder, punches respectively carried by said rock arms and punch-holder and cooperating withsaid work-bed, and means for actuating said rock arms and punch holder from said driven shaft.

28. A machine of the class described comprising a work-bed, a driven shaft, a plurality of swinging rock arms, a laterally reciprocating punch-holder, punches carried by said rock arms and punch-holder and cooperating with said work-bed, and means for actuating said rock arms and punch-holder in afpredetermined sequence from said driven sha t.

29. A machine of the class described comprising a curved work-bed, a driven shaft havin its axis substantially coincident with that of said work-bed, a plurality of rock arms swinging in planes radial to the axis of said shaft, a punch-holder mounted to reciprocate along a line parallel to the axis of said shaft, and means for oscillating said rock arms and reciprocating said punch holder from said driven shaft.

30. A machine of the class described comprising a curved work-bed, a driven shaft having its axis substantially coincident with that of said work-bed, a plurality of rock arms swinging in planes radial to the axis of said shaft, a punch-holder mounted to reciprocate along a line parallel to the axis of said shaft, and means for oscillating said rock arms and reciprocating said punchholder from said driven shaft in a predetermined sequence.

31. A machine of the class described cornprising awork-bed, a driven shaft, a plurality of pivotall y mounted swinging rock arms, a laterally moving punch-holder, punches respectively carried by said rock arms and punch-holder and cooperating with said work-bed, an eccentric on said shaft, and means for oscillating said rock arms and re ciprocating said punch holder from said eccentric.

32. A machine of the class described comprising a curved work-bed, a driven shaft having its axis substantially coincident with that of said work-bed, a plurality of rock arms swinging in planes radial to the axis of said shaft, a punch holder mounted to reciprocate along a line parallel to the axis of said shaft, an eccentric on said shaft, and means for oscillating said rock arms ""and reciprocating said punch holder from said eccentric in a predetermined sequence.

33. A machine of the class described comprising a table, work supporting members at each end of the table, each having a curved Work-bed, a driven shaft. a set of punch-holders for each work-bed, punches carried thereby and respectively cooperating said shaft for actuating the punch holders of both sets simultaneously.

34. A machine of the class described comprising a table, work supporting members at each end of said table, each having a curved work-bed, a driven shaft, a set of punch holders cooperating with each workbed, and connections between said driven shaft and both sets of punch holders for actuating the punch holdersof each set in a predetermined sequence.

35. A machine of the class described comprising a table, work supporting members at each end of said table, each having a curved work-bed, a driven shaft, a gang of pivotally mounted swinging rock arms for each work-bed, punches carried thereby and respectively cooperating with said work-beds, and means for oscillating the rock arms of each gang from said driven shaft.

36. A machine of the class described comprising a table, work supporting members at each end of said table, each having a curved work-bed, a driven shaft, a set of swinging rock arms for each work-bed, each carrying punches cooperating with said work-bed, and means for oscillating said rock arms from said shaft so that the rock arms of each set move in a predetermined sequence.

37. A machine of the class described comprising a table, work-supporting members at each end of said table, each having a' curved work-bed, a driven shaft having its axis substantially coincident with that of the curved worlcbeds, a set of swinging rock arms for each work-bed, each carrying punches cooperating with said work-beds,

and means for oscillating said rock arms from said shaft so that the rock arms of each set move in a predetermined sequence.

38. A machine of the class described. comprising a table, work-supporting members at each end of said table, each having a curved work-bed and a substantially vertical shoulder in front of said work-bed, means for clamping the work to said shoulders, and a plurality of punches cooperating with said work-beds. v

39. A machine of the class described comprising a table, work-supporting members at each end of said table, each having a curved work-bed, means for clamping a tonneau panel in place on said work-supporting members with the upper walls of the tonneau wheel housings resting on sair curved work beds, and a plurality of punches cooperating with'said work-beds.

40. A machine of the class described com prising a table, work-supporting members with said work-beds, and connections with I at each and of said table, each having a curved work-bed and a horizontal ledge below said workbed, means for holding a tonneau panel on said work-supporting memberswith its lower side edges resting on said ledg and the upper walls of the tonneau wheellibusings resting on said. curved Work-beds, a plurality of punches cooperating with said Work-beds, and means for actuating said punches.

In testimony whereof, I affix my signature.

WALTER H. DARDENN E. 

